Under the employment provisions (title I), there is no definition of service animal and no specific guidelines for employers to follow when an employee asks to bring a service animal to work.
Because title I does not specifically address service animals, a request from an employee to bring a service animal to work can be processed like any other request for reasonable accommodation.
However, employers need to be aware that documentation may not always be from a doctor or some other health care professional.
In some cases, the documentation should come from the appropriate provider of a service.
You should ask your employer before bringing a service animal to work unless the employer allows animals in the workplace in general.